Garden Gnome Software

I created a tour, saved it and closed it. I opened it today to make some changes, and while all the nodes are still there, the panoramas all have a question mark and no pano. The non-existent panoramas are still linked in the map, and clicking on a panorama shows the associated hotspt on the map, but the images don't show. All the images are in the same folder as the project file.

Any idea how to get them back?

I opened and closed Pano2VR and this went away. Thanks.